Spool for photographic films



Oct 1933- T. s. BAXENDEN ET AL 1,931,219

sPooL' FOR PHOTOGRAPHIC FILMS Filed Oct. 20, 1930 mvsmoas QIYGIIAXENDER LRBQLLYBA ATTORNEY Patented Oct. 17, 1933 PA ENT OFFICE SPOOL FOR PHOTOGRAPHIC FILMS Thomas George Baxenden, W

atford, and John (Jollyear, Bushey, England Application October 20, 1930, Serial No. 489,959, and in Great Britain October 30,1929

3 Claims (Cl. 242- 71) This invention relates to spools of the type used 7 in film cameras and more particularly to spools made of sheet metal. H

, Spools hitherto made of metal consist of a tubular part having diametrically oppositely disposed elongat'edopenings, one of whichis equal in length to the width of a film and the other of suitable length to accommodate the tapering end of the red-black paper 10 in well known manner.

Such'spools are also constructed with endwhich covers a film pieces constituting flanges for the spools, one end-.

piece having a centrally disposed perforation for the axial stud on which it revolves, and the other 1 end-piece akey-hole consisting of acentral opening havingdiamertically opposite notches, one. edge of each of the respective notches having that portion" of the metal which remains on one edge after formation of the-hole by stamping, bent inwards. r

"One object of this invention is to provide means for facilitating expeditious insertion of the before-mentioned red-black paper through'the opposed openings in i'nstances when, for example.

an internal configuration conforming to that of the stud on which the spool revolves and of the key-hole and key to constitute a stop for the latter.

With this construction insertion of the end of the paper strip covering the film is facilitated as there is no possibility of the end of the paper curling round inside the tubular portion of the spool.

* Stages in the manufacture of a preferred form of the invention together with alternative constructions are shown in the accompanying drawing, wherein:-

- Figs. 1, 2 and 3 show stages in the manufacture of one form of spool,

Figs. 4 and 5 show cross-sections of alternative constructions of the tubular portion of a spool] m for the -end discs 13, only one of which is shown.

Referring first to Fig. 1, which shows the shape of the sheet metal blank from which the tubular 'portion of the spool is made; the blank 6 is of The respective endsof the guide preferably havev substantially rectangular shape and has an elongated opening or slot 7 midway between two of its opposite edges 8, these same edges having po'r-' tions removed therefrom to constituteas'imilar slot when the edges are brought together in the manner hereinafter described. The 'slot 7 and the portions removed from edges 8 are all of the same length and form, in the finished spool, the shorter of the diametrically opposed openings for the end of the paper strip covering the film. The ends of the blank are shaped so as to provide four tongues 9, disposed as shown, for the purpose of? attaching the end discs to the tubular portion of the spool as hereinafter described. Two pairs of shallow, rectangular depressions 10, 10 are formed in the blank, the lengths of these depressions being approximately equal to the diameter of the tubular portion of the finished spool.

The depressions 10 are spaced apart fromthe de- 7 V pressions 10 a distance equal to the length of the longer of the diametrically disposed slots in thawed, and each depression is spaced from v the other of the same pair by an amount ap-1 proximately the same as the width of slot 7.

The blank 6, formed as described with ref- W erenceto Fig. l, is bent longitudinally of the' slot '7 into U-formation as shown in Fig. 2, so that the portions 10, 10 are depressed inwardly and each depression comes adjacent to the other depression of the same pair.

At a distance removed from the bend equal to the internal diameter which the spool is to have, that is to say, on a line substantially coincident with the upper ends of depressions 10, 10 the two walls of the U-formation are bent outwardly in opposite directions and are then curved inwardly to form the tubular part of the spool, the two edges 8 being brought together so that the opening formed by the cut-away portions of edges 8 coincides with slot 7 and the' straight portion 11 of the U-formation consti tutes a guide between the oppositely disposed slots for the red-black paper; These oppositely disposed slots are formed by slot 7 andthe cutaway portions of the contiguous edges 8 constituting the shorter slot, while the longer slot 12 is formed by the space between the respective pairs of inpressed portions j 10 and 10 1 When the blank is bent into this position the I tongues 9 form an extension of the body of the spool and they are then splayed outwardly in'the' manner shown in Fig. 3 to form securing means These discs are of largerdiameter than the body I J of the spool and constitute flanges therefor. The 9 ,part in tight contiguity. The end disc shown is provided with a key-hole 15 the edges of the straight portion of this key-hole being bent inwardly to form tenons 16 which register with and embrace one end of the guide 11. The other end disc is, of course, merely provided with a central hole to form a bearing for the stud on which the spool revolves.

The end portions of the guide ll'may, if necessary, be indented to form an internal configura-' tion corresponding respectively to thatlof, the? stud on which the spool revolves, and to the. key-v hole, thereby forming a stop for the key.

'In the alternative construction shown in Fig. 4, the tubular part of the spool-formed by stamping and curving the sheet metal into tubular fore mationhas its edges bent inwardlytoconstitute parallel inturnedfianges '17 of narrow width and p which at the ends of the spool, come into contiguity, as at 18, while the part situatedbe vtween the contiguous portions 18 is separated so The guide 11 as to form the longer slot 12 I comprises a strip of metal which, bent'into' U- I formation is of a width which is nearly equal to the internal diameter of the tubular part and can be slid therein, the inturned flanges 17 passing between the parallel edges of the guide strip and preventing its axial displacement. The guide is provided with a slot 7 located at the bend, which registers with a similar slot 19 provided in the tubular portion, these slots forming to? gether the shorter of the guide slots for the end i free ends of the U-shaped memberextending in wardly whereby the free edges of the blank be- L of the paper strip covering the film.

In the other alternative form ofconstruction shown in Fig. 5, the inturned flanges 17 extend diametrically and entirely across the tubular part to constitute the. guide, their respective edges being located on either side of the shorter slot 19.

In both the constructions described with referstud and key, and the tubular portion is provided with tongues similar to tongues 9 so that end discs may be fitted in the manner described with reference to the construction first referred to.

What we claim as our invention and desireto secure by Letters Patent is:, v

1'. A photographic film spool,- c'onstructed wholly of metal, and comprising atubular body portion provided with oppositely disposed elongated openings to take the ends of the usual red black paper which covers the film and end discs attached to'said tubular body portion, said gated op'ening'sfportions of said spaced walls near, the ends thereofbeing pressed inwardly to form. depressions constituting a stop for the usual winding ,key.

2. A photographic film spool, constructed wholly of metal, and comprising atubular body portion provided with oppositelydisposedelon t gated openings therein, end discs attached tofsaid body portion, and an-internal guide within. said body portion, said guide beingformed by bending into U fo'rm a blanl; which ispartiallyslotted V on the line of the bend so as to ram twosub:

stantially parallel surfaces extending diametrioppositely disposed elongated openings,

cally across the interior'of the spool between the,

blank forming a tubular member providing oppositelydisposed elongated'fopening s therein, end. discs attachedt o said tubular member, andaU shaped guide within said ,tubular member, po r. tions of the two walls ofjthe U-shapedmember extending outwardly in opposite directions, the

come contiguous, thereby forming the-tubu1ar body portion withutwo substantially parallel SUI-1 faces extending diametrically acrossthe -interior of the spool between the. oppositely disposedelongated openings, i. 1

THOMAS.GEonGnnAx n En 

